The number of cases of cholera are rising daily, with more than 50 reported in the largest city, Cotonou, alone, Care says. Dozens of people have died as a result of the flooding in the past few weeks, officials say.

People who have lost their homes have sought shelter in medical facilities, putting pressure on the country's health system.

The UN's Office for the Co-ordination of Humanitarian Affairs (Ocha) says an appeal for funds and aid is being planned.

The rain is continuing to deluge Benin and forecasters say there is no sign yet of it abating.